问题 选择题

普通光学显微镜起放大作用的结构是(    )

A.遮光器和目镜

B.遮光器和物镜

C.遮光器和反光镜

D.目镜和物镜

答案

答案:D

题目分析:显微镜的镜头有目镜和物镜两种,物镜是安装在转换器上的,因此物镜有螺丝纹。目镜是直接放在镜筒里的,因此目镜无螺纹,显微镜的放大倍数等于目镜和物镜放大倍数的乘积。故选:D

阅读理解

New train route opens from China to Germany

A container(集装箱) train left Beijing on Wednesday on its way to Hamburg, Germany. The new service was welcomed as real progress made in international rail cooperation.

The train will travel about 9,800 kilometers through six countries, including China, Mongolia, Russia, Belarus, Poland and Germany. The trip has gained support from those in customs declaration and clearance.

Zhang Mingli, chairman of China Conainer Transportation Co., said, “This can be seen as a breakthrough in our cooperation. Today , railway officials from six countries are here to witness this event. This is very important to the development of the Asia-Europe Continental Bridge. This means of transportation has great potential for the countries involved.”

Cargo on board includes electronic products, textiles and shoes. The trip to Hamburg, Germany will take 18 days. The same trip would take at least 40 days by container ship.

Tomasl Palaszewski, vice president of Polish Natiional Railway, said, “There is big potential for container transportation to Europe.  The ceremony today shows that it will bring big benefits to all of us. So we hope that it will not only be a pilot train, but a permanent connection between China and Europe.”

Railway officials from the six countries will discuss detailed measures to advance container transportation.

Experts expect that the new land route will take a big slice of the pie of Chinese­-EU trade. But improvements in Chinese railway networks will still matter. China has plans to invest huge amounts of money to build up 18 railway container terminals in the coming five years.

63. The purpose of this passage is to _______.

A. tell us about a new train route from China to Germany

B. promote the relationships between China and Europe

C. introduce a newly-developed container train

D. improve Chinese railway conditions

64.The new train route from China to Germany will______.

A. be opened in the coming five years          B. strengthen the Chinese-EU trade

C. make it convenient for us to visit Germany    D. take the place of container ships

65.From this passage, we know that_____.

A. it was China alone that built the new train route

B. not all of the countries along the new train route will support the event

C. one of the problems in railway cooperation between countries is customs declaration and clearance

D. the train mainly carries grains from China to Europe

66.The underlined word “pilot” most probably means ______.

A. guide       B. beginning      C. cooperative   D. cargo

67. From this passage, we can safely conclude that ______

A. there will be more and more railway cooperation between China and Europe

B. more and more Chinese will have better chances to visit Europe

C. Europeans enjoy Chinese electronic products

D. China-EU trade will depend on this newly-developed cargo train

单项选择题